From e8be8a52e999b7a9ee4fc935a33ebfefad5bae3a Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Wed, 19 Jul 2023 10:03:33 +0200
Subject: Allow removing the last chain when playing

---
 src/globals.c   |  2 --
 src/main.c      |  2 +-
 src/sequencer.c | 13 +++++++++----
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/globals.c b/src/globals.c
index 1e0d964..7a55f02 100644
--- a/src/globals.c
+++ b/src/globals.c
@@ -149,6 +149,4 @@ typedef struct Chain {
     u8 playing;
 } Chain;
 
-// DEBUG:...
-// static Chain chain = {.chain = {0, 1, 2, 3, 4, 5, 6}, .active = { 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1,1, 1,1,1,1}, .len = 14};
 static Chain chain = {0};
diff --git a/src/main.c b/src/main.c
index 2cda769..61e26e7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -95,7 +95,7 @@ render_sequencer(void) {
     }
 
     if (input_handler == handle_pattern_selection ||
-            input_handler == handle_pattern_chain){
+            input_handler == handle_pattern_chain) {
         draw_pattern_chain();
     }
 
diff --git a/src/sequencer.c b/src/sequencer.c
index 9de08f8..038b608 100644
--- a/src/sequencer.c
+++ b/src/sequencer.c
@@ -565,22 +565,27 @@ handle_pattern_chain(void) {
     } else if (key_tap(KEY_B)) {
         if (chain.active[param_selection_loc]) {
             // Can't toggle current chain.
-            if (!play_status || param_selection_loc != chain.current) {
+            if (!play_status
+                    || param_selection_loc != chain.current
+                    || chain.len == 1) {
                 chain.active[param_selection_loc] = 0;
                 chain.len--;
             }
         } else {
+            if (chain.len == 0) {
+                chain.current = param_selection_loc;
+            }
             chain.active[param_selection_loc] = 1;
             chain.len++;
         }
     } else if (key_tap(KEY_L)) {
-        if (chain.active[param_selection_loc] 
+        if (chain.active[param_selection_loc]
                 && chain.chain[param_selection_loc] > 0
                 && (!play_status || param_selection_loc != chain.current)) {
             chain.chain[param_selection_loc]--;
         }
     } else if (key_tap(KEY_R)) {
-        if (chain.active[param_selection_loc] 
+        if (chain.active[param_selection_loc]
                 && chain.chain[param_selection_loc] < 7
                 && (!play_status || param_selection_loc != chain.current)) {
             chain.chain[param_selection_loc]++;
@@ -663,7 +668,7 @@ handle_pattern_selection(void) {
             size_t idx = 15 - i;
             if (chain.active[idx] == 1) {
                 // If the pattern is currently playing it can't be removed.
-                if (play_status && idx == chain.current) {
+                if (play_status && idx == chain.current && chain.len > 1) {
                     continue;
                 } else if (idx == chain.current) {
                     update_current = true;
-- 
cgit v1.2.1